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To: Lev Serebryakov <lev@FreeBSD.org>
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Cc: Ian Lepore <freebsd@damnhippie.dyndns.org>, freebsd-current@freebsd.org
Subject: Re: r239356: does it mean, that synchronous dhcp and dhcplcinet with
 disabled devd gone?
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On Tue, Aug 21, 2012 at 10:18:15PM +0400, Lev Serebryakov wrote:

> SO> Not re-request lease, simple renew.
>   Sorry, I'm not very strong in exact terms here.

dhcp client can sent different requests:

DHCPDISCOVER from 0.0.0.0 to 255.255.255.255
DHCPREQUEST from 0.0.0.0 to SERVER_IP (from DHCPOFFER)

or

DHCPRELEASE
DHCPDISCOVER from 0.0.0.0 to 255.255.255.255
DHCPREQUEST from 0.0.0.0 to SERVER_IP

or

DHCPREQUEST from 0.0.0.0 to 255.255.255.255

or

DHCPREQUEST from IP to SERVER_IP

and DHCPINFORM for quering additional parametrs after boot, w/o change
IP (for example IE request information about proxy auto config)

renew address at lease_time/2 usually DHCPREQUEST from IP to SERVER_IP.